Exactly, the zeroing out the coordinates is what you should do always. Another recomendation, but more subjective, is to use at least Blender. Sure, it will be difficult to start, but man, workflow is blazing fast, not to mention all the features it has. But the best part is the community. Being free, it means that there will be a tutorial for almost everything you can think about, and that gives it an edge over other software. But if you want to change, this is the moment. Later on it will be almost impossible, so think about that. That being said, if you follow my advice, or if you just want to try it out, hit me here on the forums and I will guide you.